How many unspent transaction outputs are there?

Question

I was wondering the other day how many unspent transaction outputs there are ?

If you just keep track of the unspent transaction outputs you could import private keys, know its balance and perform spends. How much data is this compared to the full blockchain ?

The biggest downside is that you would not have the full transaction list for a private key/address - just the transactions that you can use for future transaction inputs.

https://blockchain.info/unconfirmed-transactions – abelenky May 20 '17 at 21:12 — abelenky, May 20 '17 at 21:12

score 8 · Accepted Answer · edited May 20 '17 at 19:27

8

As of block 177778 (Apr 29, 2012 6:17:33 PM):

2944702 transactions
6904591 transaction outputs
5376092 transaction inputs
1528499 unredeemed outputs left
642432 addresses with non-zero balance

edited May 20 '17 at 19:27

Community

1

answered Apr 29 '12 at 16:34

Pieter Wuille

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Looking at the number of addresses with nonzero balance, an index versus 'list of blocks address has an unspent tx output in' I calculate would be less than 28 MB. It would then be quick to get the blocks from bitcoind and hence the key's transactions. – jim618 Apr 29 '12 at 18:43
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Would a script that reports these numbers be available anywhere? – Stephen Gornick Apr 29 '12 at 20:59
I calculated it using a patch for bitcoind that scans the blockchain at startup, not very user-friendly :) – Pieter Wuille Apr 30 '12 at 00:53
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A less time-specific answer to the question "How many unspent transaction outputs are there?" would be appreciated. – Steven Roose Jun 14 '13 at 22:01
@StevenRoose The number isn't fixed, so an answer would have to be "time-specific." – Geremia May 13 '17 at 03:35
Where/how did you obtain this info? – Geremia May 13 '17 at 03:37
@Geremia [This](https://bitcoin.stackexchange.com/a/35987/4334) shows how. – Geremia May 13 '17 at 17:37

How many unspent transaction outputs are there?

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